This cover had quite a journey, with
addresses in Nassau,
Bahamas,
and then in Lancaster and East Downington, Pennsylvania.
It even managed to get lost in New York City!

The cover originated in San Jose, Costa
Rica.
There are three purple San Jose CDS (there is a
faint CDS on the pair of 1c. violet stamps at the left).

Registration was accomplished with a
preprinted registry
label.
The back of the envelope also received a San Jose CDS.

The initial address was in Nassau, New Providence, Bahamas, B.W.I.

The cover arrived there on June 4 as noted
by the CDS on the
back.
It was then forwarded to 472 West Lemon Street, Lancaster, Penna.

To get there it went a circuitous route.
It was first received in the New York, N.Y., registry division on
June 23 as indicated by the two oval registry mark
at the left center and lower right on the back.
It then went back to the New York U.S.A. Foreign registry
for proper logging of its entry into the country.
There, on June 24, it was received with two oval registry stamps.
Then it went back to the New York, N.Y. registry
division for forwarding to Pennsylvania.
This resulted in two June 24 New York, N.Y. oval registry stamps
at the lower left and upper right of the back.

Its next stop was in the registry office
of the Lancaster,
Pennsylvania,
Post Office on June 24 (red REGISTERED CDS on back).
Then they forwarded the letter to 356 E. Lancaster Ave., East
Downington, Pennsylvania.
The three straightline FORWARDED handstamps were probably added in
Lancaster.

Surprisingly, the letter was then received
in East Downington
on June 24 as indicated by the registry CDS on the back.